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SELECTION PROCEDURE (WITH EXAMPLE)
I DETERMINE COOLING AND HEATING REQUIREMENTS
AT DESIGN CONDITIONS:
Given:
Required Cooling Capacity (TC).....................35,000 Btuh
Sensible Heat Capacity (SHC).........................25,000 Btuh
Required Heating Capacity..............................60,000 Btuh
Condenser Entering Air Temperature......................... 95°F
Indoor-Air Temperature ........................80°F edb 67°F ewb
Evaporator Air Quantity .....................................1200 CFM
External Static Pressure....................................... 0.1 in. wg
Electrical Characteristics.......................................230-1-60
II SELECT UNIT BASED ON REQUIRED COOLING
CAPACITY.
Enter Net Cooling Capacities table at condenser entering
temperature of 95 F. Unit 583B036 at 1200 cfm and 67 F
ewb (entering wet bulb) will provide a total capacity of
35,900 Btuh and a SHC of 26,700 Btuh. Calculate SHC
correction, if required, using Note 3 under Cooling
Capacities tables.
III SELECT HEATING CAPACITY OF UNIT TO PROVIDE
DESIGN CONDITION REQUIREMENT.
In the Heating Capacities and Efficiencies table on page 4,
note that the unit 583B036090 will provide 70,000 Btuh
with an input of 90,000 Btuh.
IV DETERMINE FAN SPEED AND POWER REQUIRE–
MENTS AT DESIGN CONDITIONS.
Before entering the air delivery tables, calculate the total
static pressure required. From the given example, the Wet
Coil Pressure Drop Table, and the Filter Pressure Drop table
on page 16, find at 1200 cfm:
External Static Pressure 0.1 in. wg
Filter 0.13 in. wg
Total Static Pressure 0.23 in. wg
Enter the table for Wet Coil Air Delivery — Horizontal and
Downflow Discharge on page 16. For 208 v operation,
deduct 10% from value given. At .23 ESP (external static
pressure), the fan will deliver 1327 cfm at low speed. The
fan speed should be set at low speed.
V SELECT UNIT THAT CORRESPONDS TO POWER
SOURCE AVAILABLE.
The Electrical Data table on page 21 shows that the unit is
designed to operate at 208/230-1-60.
12
43
x
y
CORNER # 024 030 036 042 048 060
1 55.1 59.5 61.0 72.6 80.0 88.9
2 52.2 56.3 57.8 68.8 75.8 84.2
3 89.9 97.0 99.5 118.4 130.5 145.1
4 92.8 100.2 102.7 122.2 134.7 149.8
TOTAL WEIGHT 290 313 321 382 421 468
583B CORNER WEIGHTS